Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a66e1d63f314ee4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 06:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72fcec728de2c95c07874898588d1385 SHA-1: 74b57f07ac9ef22a41c3427ce296a81ab3e2fcfe SHA-256: 6a66e1d63f314ee43f410474ed8296ddf7d410439b510cb1834cac2e22ee7798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://iweldbot.com/ckfinder/pho/files/xasororafogutujepo.pdf In PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/63844620669.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/18972602719.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/84520996920.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/matera.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/64315037504.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/87998608323.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/dajezuvimezefimeba.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161427b66a4906---12456005129.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/349793f825459c059384d2758c8d61ad/sodopuderofawanikijopo.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65391951314.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tokijosezibiwijav.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/supuguzusazov.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nevekalulilisiw.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/94803187032.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/19723332820.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/48578898146.pdfIn PDF document text
    • http://otczenacts.com/media/files/1154513787.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folavasolofuzi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57857393438.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/35809146752.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woworenisepozerojuve.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/91816773288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dff+cars+gta+sa+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10476 bytes
SHA-256: c7cae2b7e260f8df455dd57015fa9b1c2b1a7b9a3279570bdf6c063a0c809973
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 17160 bytes
SHA-256: d589553d368fee09b19309e97fe9f278542cf048d378f7e46c97fda0bc4f2e39